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© 2011 PosterPresentations.com 2117 Fourth Street , Unit C Berkeley CA 94710 posterpresenter@gmail.com

Simranpreet Kaur*1, Kevin Watteyne2, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2Bayer CropScience, Lincoln, NE

e-mail: simranpreet.kaur@huskers.unl.edu

Introduction

Giant Ragweed (Ambrosia trifida L.) is a vigorous weed resulting upto 13.6% grain yield loss in corn at a

density of 1 plant per 10 m-2 (Harrison et al. 2001).

No-till corn production is widely adopted by growers due to reduced soil erosion, improved water

retention and low fuel and labor cost, leaving herbicides as the only weed control option

The reduced emergence of summer annual weeds is achieved by using residual herbicides such as

chlorimuron, tribenuron and sulfentrazone.

A Pre-packed tank mixture of thiencarbazone- methyl plus iodosulfuron- methyl (Autumn™ Super) has

been recently registered for post-harvest burndown and early spring control prior to planting corn and

soybean.

Burndown activity of the herbicide can be enhanced by tank mixing it with 2,4-D, glyphosate, dicamba

and metribuzin.

Material and Methods

To determine the influence of thiencarbazone- methyl plus iodosulfuron- methyl applied in fall and early

spring in controlling glyphosate resistant giant ragweed in no-till corn.

To compare the efficacy when tank mixed with 2,4-D, dicamba and metribuzin.

Field experiment was conducted at Clay County, NE in a field infested with glyphosate-resistant giant ragweed.

Herbicide treatments were applied at recommended rate in fall of 2012 or early spring of 2013 or with a split

application in fall and early spring at least 30 days prior to planting no-till corn.

Randomized complete block design was followed with four replications and twelve treatments (including

nontreated control).

All treatments include blanket application of Thiencarbazone-methyl plus isoxaflutole at 78 g ai/ha + Atrazine

at 560 g ai/ha applied as pre- emergence fb Tembotrione at 92 g ai/ha + atrazine at 560 g ai/ha applied as post

emergence.

Data was subjected to ANOVA using PROC MIXED procedure in SAS.

Objectives

Table1. Details of treatments

Results

Thiencarbazone plus iodosulfuron tank mixed with 2,4-D, dicamba, or metribuzin provided >95% control

of giant ragweed and other winter annuals including tansy mustard, henbit, and field pennycress

compared with treatments without thiencarbazone- methyl plus iodosulfuron- methyl.

Nontreated control Thiencarbazone plus iodosulfuron

(Early spring)

Metribuzin (Fall)

Thiencarbazone plus iodosulfuron

+ dicamba (Fall and early spring)

Thiencarbazone plus iodosulfuron

+ 2,4- D (Fall and early spring)

Thiencarbazone plus iodosulfuron

+ metribuzin (Fall and early spring)

0

77 75

71

51

81

45

79

22

79

48

78

0

10

20

30

40

50

60

70

80

90

100

1 2 3 4 5 6 7 8 9 10 11 12

CO

NT

RO

L (

%)

ab ab ab

bc

a

cd

ab

d

ab

bcd

ab

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1 2 3 4 5 6 7 8 9 10 11 12

YIE

LD

(kg/h

a)

d

ab ab ab ab

a

ab

ab

c

ab bc

b

Conclusions

Fig.1. (A) Control of glyphosate- resistant giant ragweed at 21 Days after Early Spring treatment (B) Yield of

Corn at harvest (below) (B)

(A)

Herbicide Application

timing

Code Rate

g ae or ai ha-1

Nontreated control - 1 -

Thiencarbazone plus Iodosulfuron Fall 2 17.9

Thiencarbazone plus Iodosulfuron Early Spring 3 17.9

Thiencarbazone plus Iodosulfuron fb

Thiencarbazone plus Iodosulfuron

Fall

Early Spring

4 8.9

8.9

Dicamba fb

Dicamba

Fall

Early Spring

5 560

560

Thiencarbazone plus Iodosulfuron+dicamba fb

Thiencarbazone plus Iodosulfuron+dicamba

Fall

Early Spring

6 8.9 + 560

8.9 + 560

2,4- D fb

2,4-D

Fall

Early Spring

7 830

830

Thiencarbazone plus Iodosulfuron+2,4- D fb

Thiencarbazone plus Iodosulfuron+2,4- D

Fall

Early Spring

8 8.9 + 830

8.9 + 830

Glyphosate Fall 9 840

Thiencarbazone plus Iodosulfuron+Glyphosate fb

Thiencarbazone plus Iodosulfuron+Glyphosate

Fall

Early Spring

10 8.9 + 840

8.9 + 840

Metribuzin Fall 11 315

Thiencarbazone plus Iodosulfuron+Metribuzin fb

Thiencarbazone plus Iodosulfuron+Metribuzin

Fall

Early Spring

12 8.9 + 315

8.9 + 315

Field infested with Glyphosate-

resistant giant ragweed

Harrison, S. K., E. E. Regnier, J. T. Schmoll, and J. F. Webb. 2001. Competition and fecundity of giant ragweed in corn. Weed Sci. 49:224–229.